ELECTRON TIME-OF-FLIGHT VELOCITY SELECTOR.
Abstract
A time-of-flight velocity selector was constructed that is designed for measurement of the collision probabilities in gases of electrons in the energy region below 1 V, since beam-deflection methods become very difficult and few data exist in this energy region. In this spectrometer, a gold photoemitter, illuminated by a zinc spark gap, repetitively emits bursts of electrons with a continuum of energies from 0 to about 1 eV. The electrons drift up a well-shielded drift chamber coated with aquadag. A portion pass through a gold grid 44 cm from the emitter, into an accelerating field that imparts energy sufficient for detection by a phosphor or secondary multiplier, and are registered by time analysis. Design problems are discussed. Measured photoelectron time spectra are compared with the energy spectrum obtained by the retarding-potential method. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 31, 1964
- Accession Number
- AD0435842
Entities
People
- G. C. Baldwin
- S. I. Friedman
Organizations
- General Electric